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<a name="1" href="#1">1</a>   <em class="jxr_comment">// kObjects</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment">//</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment">// Copyright (C) 2001 Stefan Haustein, Oberhausen (Rhld.), Germany</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment">//</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment">// Contributors:</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment">//</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment">// License: LGPL</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment">//</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment">// This library is free software; you can redistribute it and/or</em>
<a name="10" href="#10">10</a>  <em class="jxr_comment">// modify it under the terms of the GNU Lesser General Public License</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment">// as published by the Free Software Foundation; either version 2.1 of</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment">// the License, or (at your option) any later version.</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment">//</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment">// This library is distributed in the hope that it will be useful, but</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment">// WITHOUT ANY WARRANTY; without even the implied warranty of</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</em>
<a name="17" href="#17">17</a>  <em class="jxr_comment">// Lesser General Public License for more details.</em>
<a name="18" href="#18">18</a>  <em class="jxr_comment">//</em>
<a name="19" href="#19">19</a>  <em class="jxr_comment">// You should have received a copy of the GNU Lesser General Public</em>
<a name="20" href="#20">20</a>  <em class="jxr_comment">// License along with this library; if not, write to the Free Software</em>
<a name="21" href="#21">21</a>  <em class="jxr_comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307</em>
<a name="22" href="#22">22</a>  <em class="jxr_comment">// USA</em>
<a name="23" href="#23">23</a>  
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">package</strong> com.totsp.gwittir.client.util;
<a name="26" href="#26">26</a>  
<a name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a name="28" href="#28">28</a>  
<a name="29" href="#29">29</a>  
<a name="30" href="#30">30</a>  <em class="jxr_comment">/*</em>
<a name="31" href="#31">31</a>  <em class="jxr_comment"> * You can now use also javax.mail.internet.MimeUtility</em>
<a name="32" href="#32">32</a>  <em class="jxr_comment"> * and sun.misc.BASE64Encoder.encode.</em>
<a name="33" href="#33">33</a>  <em class="jxr_comment"> * There is a non-public class in Java 1.4+ called java.util.prefs.Base64</em>
<a name="34" href="#34">34</a>  <em class="jxr_comment"> */</em>
<a name="35" href="#35">35</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> Base64 {
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong>[] charTab =
<a name="38" href="#38">38</a>          <span class="jxr_string">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"</span>.toCharArray ();
<a name="39" href="#39">39</a>  
<a name="40" href="#40">40</a>  
<a name="41" href="#41">41</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String encode (byte [] data) {
<a name="42" href="#42">42</a>          <strong class="jxr_keyword">return</strong> encode (data, 0, data.length, <strong class="jxr_keyword">null</strong>).toString ();
<a name="43" href="#43">43</a>      }
<a name="44" href="#44">44</a>  
<a name="45" href="#45">45</a>  
<a name="46" href="#46">46</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Encodes the part of the given byte array denoted by start and</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">        len to the Base64 format.  The encoded data is appended to the</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">        given StringBuffer. If no StringBuffer is given, a new one is</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">        created automatically. The StringBuffer is the return value of</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">        this method. */</em>
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>  
<a name="53" href="#53">53</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> StringBuffer encode (byte [] data, <strong class="jxr_keyword">int</strong> start, <strong class="jxr_keyword">int</strong> len, StringBuffer buf) {
<a name="54" href="#54">54</a>  
<a name="55" href="#55">55</a>          <strong class="jxr_keyword">if</strong> (buf == <strong class="jxr_keyword">null</strong>)
<a name="56" href="#56">56</a>              buf = <strong class="jxr_keyword">new</strong> StringBuffer (data.length * 3 / 2);
<a name="57" href="#57">57</a>  
<a name="58" href="#58">58</a>          <strong class="jxr_keyword">int</strong> end = len - 3;
<a name="59" href="#59">59</a>          <strong class="jxr_keyword">int</strong> i = start;
<a name="60" href="#60">60</a>          <strong class="jxr_keyword">int</strong> n = 0;
<a name="61" href="#61">61</a>  
<a name="62" href="#62">62</a>          <strong class="jxr_keyword">while</strong> (i &lt;= end) {
<a name="63" href="#63">63</a>              <strong class="jxr_keyword">int</strong> d = (((data [i]) &amp; 0x0ff) &lt;&lt; 16)
<a name="64" href="#64">64</a>                  | (((data [i+1]) &amp; 0x0ff) &lt;&lt; 8)
<a name="65" href="#65">65</a>                  | ((data [i+2]) &amp; 0x0ff);
<a name="66" href="#66">66</a>  
<a name="67" href="#67">67</a>              buf.append (charTab [(d &gt;&gt; 18) &amp; 63]);
<a name="68" href="#68">68</a>              buf.append (charTab [(d &gt;&gt; 12) &amp; 63]);
<a name="69" href="#69">69</a>              buf.append (charTab [(d &gt;&gt; 6) &amp; 63]);
<a name="70" href="#70">70</a>              buf.append (charTab [d &amp; 63]);
<a name="71" href="#71">71</a>  
<a name="72" href="#72">72</a>              i += 3;
<a name="73" href="#73">73</a>  
<a name="74" href="#74">74</a>              <strong class="jxr_keyword">if</strong> (n++ &gt;= 14) {
<a name="75" href="#75">75</a>                  n = 0;
<a name="76" href="#76">76</a>                  buf.append (<span class="jxr_string">"\r\n"</span>);
<a name="77" href="#77">77</a>              }
<a name="78" href="#78">78</a>          }
<a name="79" href="#79">79</a>  
<a name="80" href="#80">80</a>  
<a name="81" href="#81">81</a>          <strong class="jxr_keyword">if</strong> (i == start + len - 2) {
<a name="82" href="#82">82</a>              <strong class="jxr_keyword">int</strong> d = (((data [i]) &amp; 0x0ff) &lt;&lt; 16)
<a name="83" href="#83">83</a>                  | (((data [i+1]) &amp; 255) &lt;&lt; 8);
<a name="84" href="#84">84</a>  
<a name="85" href="#85">85</a>              buf.append (charTab [(d &gt;&gt; 18) &amp; 63]);
<a name="86" href="#86">86</a>              buf.append (charTab [(d &gt;&gt; 12) &amp; 63]);
<a name="87" href="#87">87</a>              buf.append (charTab [(d &gt;&gt; 6) &amp; 63]);
<a name="88" href="#88">88</a>              buf.append (<span class="jxr_string">"="</span>);
<a name="89" href="#89">89</a>          }
<a name="90" href="#90">90</a>          <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (i == start + len - 1) {
<a name="91" href="#91">91</a>              <strong class="jxr_keyword">int</strong> d = ((data [i]) &amp; 0x0ff) &lt;&lt; 16;
<a name="92" href="#92">92</a>  
<a name="93" href="#93">93</a>              buf.append (charTab [(d &gt;&gt; 18) &amp; 63]);
<a name="94" href="#94">94</a>              buf.append (charTab [(d &gt;&gt; 12) &amp; 63]);
<a name="95" href="#95">95</a>              buf.append (<span class="jxr_string">"=="</span>);
<a name="96" href="#96">96</a>          }
<a name="97" href="#97">97</a>  
<a name="98" href="#98">98</a>          <strong class="jxr_keyword">return</strong> buf;
<a name="99" href="#99">99</a>      }
<a name="100" href="#100">100</a> 
<a name="101" href="#101">101</a> 
<a name="102" href="#102">102</a>     <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> decode (<strong class="jxr_keyword">char</strong> c) {
<a name="103" href="#103">103</a>         <strong class="jxr_keyword">if</strong> (c &gt;= 'A' &amp;&amp; c &lt;= 'Z')
<a name="104" href="#104">104</a>             <strong class="jxr_keyword">return</strong> c - 65;
<a name="105" href="#105">105</a>         <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (c &gt;= 'a' &amp;&amp; c &lt;= 'z')
<a name="106" href="#106">106</a>             <strong class="jxr_keyword">return</strong> c - 97 + 26;
<a name="107" href="#107">107</a>         <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (c &gt;= '0' &amp;&amp; c &lt;= '9')
<a name="108" href="#108">108</a>             <strong class="jxr_keyword">return</strong> c - 48 + 26 + 26;
<a name="109" href="#109">109</a>         <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">switch</strong> (c) {
<a name="110" href="#110">110</a>         <strong class="jxr_keyword">case</strong> '+': <strong class="jxr_keyword">return</strong> 62;
<a name="111" href="#111">111</a>         <strong class="jxr_keyword">case</strong> '/': <strong class="jxr_keyword">return</strong> 63;
<a name="112" href="#112">112</a>         <strong class="jxr_keyword">case</strong> '=': <strong class="jxr_keyword">return</strong> 0;
<a name="113" href="#113">113</a>         <strong class="jxr_keyword">default</strong>:
<a name="114" href="#114">114</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> RuntimeException (<strong class="jxr_keyword">new</strong> StringBuffer(<span class="jxr_string">"unexpected code: "</span>).append(c).toString());
<a name="115" href="#115">115</a>         }
<a name="116" href="#116">116</a>     }
<a name="117" href="#117">117</a> 
<a name="118" href="#118">118</a> 
<a name="119" href="#119">119</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Decodes the given Base64 encoded String to a new byte array.</em>
<a name="120" href="#120">120</a> <em class="jxr_javadoccomment">        The byte array holding the decoded data is returned. */</em>
<a name="121" href="#121">121</a> 
<a name="122" href="#122">122</a> 
<a name="123" href="#123">123</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> byte[] decode (String s) {
<a name="124" href="#124">124</a> 
<a name="125" href="#125">125</a>         <strong class="jxr_keyword">int</strong> i = 0;
<a name="126" href="#126">126</a>         ArrayList&lt;Byte&gt; bos = <strong class="jxr_keyword">new</strong> ArrayList&lt;Byte&gt;();
<a name="127" href="#127">127</a>         <strong class="jxr_keyword">int</strong> len = s.length ();
<a name="128" href="#128">128</a> 
<a name="129" href="#129">129</a>         <strong class="jxr_keyword">while</strong> (<strong class="jxr_keyword">true</strong>) {
<a name="130" href="#130">130</a>             <strong class="jxr_keyword">while</strong> (i &lt; len &amp;&amp; s.charAt (i) &lt;= ' ') i++;
<a name="131" href="#131">131</a> 
<a name="132" href="#132">132</a>             <strong class="jxr_keyword">if</strong> (i == len) <strong class="jxr_keyword">break</strong>;
<a name="133" href="#133">133</a> 
<a name="134" href="#134">134</a>             <strong class="jxr_keyword">int</strong> tri = (decode (s.charAt (i)) &lt;&lt; 18)
<a name="135" href="#135">135</a>                 + (decode (s.charAt (i+1)) &lt;&lt; 12)
<a name="136" href="#136">136</a>                 + (decode (s.charAt (i+2)) &lt;&lt; 6)
<a name="137" href="#137">137</a>                 + (decode (s.charAt (i+3)));
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>             bos.add ((byte)((tri &gt;&gt; 16) &amp; 255));
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">if</strong> (s.charAt (i+2) == '=') <strong class="jxr_keyword">break</strong>;
<a name="141" href="#141">141</a>             bos.add ((byte)((tri &gt;&gt; 8) &amp; 255));
<a name="142" href="#142">142</a>             <strong class="jxr_keyword">if</strong> (s.charAt (i+3) == '=') <strong class="jxr_keyword">break</strong>;
<a name="143" href="#143">143</a>             bos.add((byte)(tri &amp; 255));
<a name="144" href="#144">144</a> 
<a name="145" href="#145">145</a>             i += 4;
<a name="146" href="#146">146</a>         }
<a name="147" href="#147">147</a>         byte[] val = <strong class="jxr_keyword">new</strong> byte[bos.size()];
<a name="148" href="#148">148</a>         <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> j=0; j &lt; val.length; j++){
<a name="149" href="#149">149</a>             val[j] =bos.get(j);
<a name="150" href="#150">150</a>         }
<a name="151" href="#151">151</a>         <strong class="jxr_keyword">return</strong> val;
<a name="152" href="#152">152</a>     }
<a name="153" href="#153">153</a> 
<a name="154" href="#154">154</a>    
<a name="155" href="#155">155</a> }
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